Re: [PATCH] nfsd: don't destroy global nfs4_file table in per-net shutdown

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> On Feb 11, 2023, at 7:50 AM, Jeff Layton <jlayton@xxxxxxxxxx> wrote:
> 
> The nfs4_file table is global, so shutting it down when a containerized
> nfsd is shut down is wrong and can lead to double-frees. Tear down the
> nfs4_file_rhltable in nfs4_state_shutdown instead of
> nfs4_state_shutdown_net.

D'oh!


> Fixes: d47b295e8d76 (NFSD: Use rhashtable for managing nfs4_file objects)
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2169017
> Reported-by: JianHong Yin <jiyin@xxxxxxxxxx>
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>

Thanks to you and JianHong. Applied to nfsd-fixes.


> ---
> fs/nfsd/nfs4state.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index af22dfdc6fcc..a202be19f26f 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -8218,7 +8218,6 @@ nfs4_state_shutdown_net(struct net *net)
> 
> 	nfsd4_client_tracking_exit(net);
> 	nfs4_state_destroy_net(net);
> -	rhltable_destroy(&nfs4_file_rhltable);
> #ifdef CONFIG_NFSD_V4_2_INTER_SSC
> 	nfsd4_ssc_shutdown_umount(nn);
> #endif
> @@ -8228,6 +8227,7 @@ void
> nfs4_state_shutdown(void)
> {
> 	nfsd4_destroy_callback_queue();
> +	rhltable_destroy(&nfs4_file_rhltable);
> }
> 
> static void
> -- 
> 2.39.1
> 

--
Chuck Lever







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